Summary - Primitive types

Write a profile card by combining string, number, and boolean types.

The three primitive types

So far you have seen three primitive types: string for text, number for numbers (integer or decimal), and boolean for two-state logic. You also learned to declare variables with let and const.

let isim: string = "Ece";
let yas: number = 28;
let aktif: boolean = true;
const dil = "TypeScript";

These four pieces are the foundation of TypeScript.

Exercise Use the three types together

Declare three variables: urun (string, value "Kalem"), adet (number, value 3), stokta (boolean, value true). Print all three with a single console.log.

Show example solution

let urun: string = "Kalem";
let adet: number = 3;
let stokta: boolean = true;
console.log(urun, adet, stokta);

Test yourself

Which of the following lines uses the correct types?
- let x: number = "5"; let y: string = a; let z: boolean = true;
- let x: int = 5; let y: string = "a"; let z: float = 3.14;
- let x: number = 5; let y: text = "a"; let z: bool = true;
- let x: number = 5; let y: string = "a"; let z: boolean = true;
Show answer

let x: number = 5; let y: string = "a"; let z: boolean = true; — number, string, and boolean are written lowercase; the values must also match the type.

Fill in the missing value

let tam: number = 42;
let metin: string = ____;
let dogru: boolean = true;

Show answer

let tam: number = 42;
let metin: string = "kod";
let dogru: boolean = true;

Primitive types and keywords

string

text type
number

numeric type
boolean

logical type
const

constant variable

Next lesson: Array type

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